/*
* Copyright (c) 2006-2007 Erin Catto http:
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked, and must not be
* misrepresented the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

goog.provide('box2d.CollisionFilter');

/**
 @constructor
 */
box2d.CollisionFilter = function() {};


/**
  Return true if contact calculations should be performed between these two shapes.
  @param {!box2d.Shape} shape1
  @param {!box2d.Shape} shape2
  @return {boolean}
*/
box2d.CollisionFilter.prototype.ShouldCollide = function(shape1, shape2) {
  if (shape1.m_groupIndex == shape2.m_groupIndex && shape1.m_groupIndex != 0) {
    return shape1.m_groupIndex > 0;
  }

  var collide = (shape1.maskBits & shape2.categoryBits) != 0 && (shape1.categoryBits & shape2.maskBits) != 0;
  return collide;
};

/**
  @type {!box2d.CollisionFilter}
  @const
*/
box2d.CollisionFilter.b2_defaultFilter = new box2d.CollisionFilter();
